According to an Airbus A220 airworthiness directive issued by Transport Canada on May 13, the fuel flowing to engines could be blocked due to fuel tubes eroded by a clamp.
The directive says that operators have reported damages on multiple aircraft caused by bonding clamps that are touching the tubes.
Transport Canada mandated Airbus A220 operators to inspect right and left fuel feed tubes within 1,800 flight hours. The directive also requires constant checks every 1,800 hours.
More details on airlinerwatch.com